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Title: Studies on enzymatic hair removal and softening of cotton hosiery yarns
Authors: Dhurai, Bhaarathi
Natarajan, V
Keywords: Box & Behnken design;Cellulase enzyme;Cotton hosiery yarn;Compressional properties;Frictional softness;Quasi-Newton optimization method
Issue Date: Dec-2006
Publisher: NISCAIR-CSIR, India
IPC Code: Int. Cl.8 D06B3/00
Abstract: Enzyme softening of ring-spun carded and combed, and rotor-spun yarns of 30s count (19.68 tex) has been carried out using Bio-soft L+ enzyme with the aim of improving their knittabi lity through improvement in yarn hairiness and frictional properties. A central composite rotatable design, proposed by Box and Behnken, was used to conduct experiment for developing mathematical models for the yarn characteristics, such as hairiness, kinetic friction and compression properties, in terms of the variables, namely enzyme concentration, temperature and treatment time. Quasi-Newton numerical method was used to optimize the process variables of enzyme softening treatment and the responses with reduction in hairiness index considered as the objective function. The studies show that the enzyme softening not only results in reduction of hairiness and improvement of frictional coefficients but also leads to improved compressional softness of yarns. Enzyme softening of ring-spun carded yarn results in high level of reduction in hairiness (28%) and kinetic friction (50%). The improvement in compressional softness is pronounced in rotor-spun yarn, while hairiness reduction is predominant in ring-spun yarns. Optimum values for process variables have been mathematically calculated from the experimental results. Optimized conditions for enzyme softening are found to be 2.25-3% (owm) enzyme concentration, 50°C temperature and 50-60 min treatment time.
Page(s): 565-572
ISSN: 0975-1025 (Online); 0971-0426 (Print)
Appears in Collections:IJFTR Vol.31(4) [December 2006]

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